package com.hongyun.tms.infra.excel.config;

import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.metadata.data.CellData;
import com.alibaba.excel.metadata.data.WriteCellData;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.style.column.AbstractColumnWidthStyleStrategy;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Sheet;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 自适应单元格宽度
 *
 * @author lipeng
 * @date 2024-09-08
 */
public class CustomCellWriteWidthConfig extends AbstractColumnWidthStyleStrategy {

    private final Map<Integer, Map<Integer, Integer>> CACHE = new HashMap<>();

    @Override
    protected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<WriteCellData<?>> cellDataList, Cell cell, Head head, Integer integer, Boolean isHead) {
        boolean needSetWidth = isHead || !CollectionUtils.isEmpty(cellDataList);
        if (needSetWidth) {
            Map<Integer, Integer> maxColumnWidthMap = CACHE.computeIfAbsent(writeSheetHolder.getSheetNo(), k -> new HashMap<>());
            Integer columnWidth = this.dataLength(cellDataList, cell, isHead);
            if (columnWidth > 0) {
                // 中文字符算2个长度，英文字符算1个长度
                int adjustedWidth = Math.min(Math.max(columnWidth + 5, 10), 50);  // 动态调整宽度范围
                Integer maxColumnWidth = maxColumnWidthMap.get(cell.getColumnIndex());
                if (maxColumnWidth == null || adjustedWidth > maxColumnWidth) {
                    maxColumnWidthMap.put(cell.getColumnIndex(), adjustedWidth);
                    Sheet sheet = writeSheetHolder.getSheet();
                    sheet.setColumnWidth(cell.getColumnIndex(), 256 * adjustedWidth + 184);
                }
            }
        }
    }

    /**
     * 计算长度
     *
     * @param cellDataList
     * @param cell
     * @param isHead
     * @return
     */
    private Integer dataLength(List<WriteCellData<?>> cellDataList, Cell cell, Boolean isHead) {
        if (isHead) {
            return cell.getStringCellValue().getBytes().length;
        } else {
            CellData<?> cellData = cellDataList.get(0);
            CellDataTypeEnum type = cellData.getType();
            if (type == null) {
                return -1;
            } else {
                switch (type) {
                    case STRING:
                        String stringValue = cellData.getStringValue();
                        // 通过正则匹配 "\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}"，判断是否是 yyyy-MM-dd HH:mm:ss 格式的时间字段。
                        if (stringValue.matches("\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}")) {
                            return 20; // 时间格式的长度为固定的 19
                        }
                        int index = stringValue.indexOf("\n");
                        return index != -1 ? stringValue.substring(0, index).getBytes().length + 1 : stringValue.getBytes().length + 1;
                    case BOOLEAN:
                        return cellData.getBooleanValue().toString().getBytes().length;
                    case NUMBER:
                        return cellData.getNumberValue().toString().getBytes().length;

                    case DATE:
                        LocalDateTime dateValue = ((WriteCellData) cellData).getDateValue();
                        if (dateValue != null) {
                            return 22; // 时间格式的长度为固定的 22
                        }
                        return cellData.getNumberValue().toString().getBytes().length;
                    default:
                        return -1;
                }
            }
        }
    }


}
